--- Makefile.am.orig    2019-12-25 09:42:04.990000000 +0800
+++ Makefile.am    2019-12-25 09:42:26.300000000 +0800
@@ -1,5 +1,7 @@
 ## Process this file with automake to produce Makefile.in

+AUTOMAKE_OPTIONS = subdir-objects foreign
+
 # Make sure that when we re-make ./configure, we get the macros we need
 ACLOCAL_AMFLAGS = -I m4

